javascript - Protractor 页面对象继承

Question

鉴于我正在利用页面对象模式构建我的 angularjs Protractor e2e 测试套件。

并且我尽可能合理地将页面对象代码分开在不同的文件中。

1. 启用页面对象继承的好方法是什么？ javascript经典继承？基于 Object.create() 的继承？其他？

2. 我应该在页面对象中保持期望吗？或支持 Martin Fowler optinion by moving them to an assertion library ?在这种情况下，在这个 javascript-nodejs 技术堆栈中究竟会是什么样子？

我准备了一个live jsfiddle playground here所以你可以尝试你的改进。

或者只是在答案中粘贴代码，为了清楚起见，我将在下面粘贴 jsfiddle 内容:

loginPage.js

"use strict";

// A Page Object is a Singleton, so no need to constructors or classic js inheritance,
// please tell me if I'm wrong or what's the utility of creating a (new LoginPage())
// every time a spec need to use this login page.
var loginPage = {
    // Page Object Elements
    userElm: $('.user.loginPage'),

    // Page Object Assertions
    // Martin Fowler [doesn't favor](http://martinfowler.com/bliki/PageObject.html)
    // assertions in page objects, I'm open to suggestions on how to move 
    // the assertions away from the Page Object and see how an assertion library 
    // could like like in protractor.
    assertInputsDisplayed: function() {
        return ('Assertion: this.userElm: '+this.userElm);
    },

    // Page Object Actions
    get: function () {
        return ('navigating to LoginPage with userElm: '+this.userElm);
    }
};

module.exports.loginPage = loginPage;

loginDialog.js

"use strict";

var loginPage = require('./loginPage.js').loginPage;
var helpers = require('./helpers.js');

// Inherit properties from another Page Object
var loginDialog = helpers.extend({}, Object.create(loginPage), {
    // Page Object Elements
    userElm: $('.user.loginDialog'),

    // Page Object Actions
    get: function () {
        return ('navigating to LoginDialog with userElm: '+this.userElm);
    },

    logout: function () {
        return ('logging out of Dialog. user was: '+this.userElm);
    }
});

module.exports.loginDialog = loginDialog;

helpers.js

"use strict";

// some helper to avoid adding an external dependency for now
var extend = function(target) {
    var sources = [].slice.call(arguments, 1);
    sources.forEach(function (source) {
        for (var prop in source) {
            target[prop] = source[prop];
        }
    });
    return target;
};

usage.js

"use strict";

// Mock $() for easy unit testing this on nodejs REPL
global.$ = function(args) { return ('$BUILT '+args); };

var loginPage   = require('./loginPage.js').loginPage;
var loginDialog = require('./loginDialog.js').loginDialog;

console.log(loginPage.userElm);    //=> '$BUILT .user.loginPage'
console.log(loginDialog.userElm);  //=> '$BUILT .user.loginDialog'
console.log(loginPage.get());      //=> 'navigating to LoginPage with userElm: $BUILT .user.loginPage'
console.log(loginDialog.get());    //=> 'navigating to LoginPage with userElm: $BUILT .user.loginDialog'
console.log(loginPage.assertInputsDisplayed());   //=> 'LoginPage assertion: this.userElm: $BUILT .user.loginPage'
console.log(loginDialog.assertInputsDisplayed()); //=> 'LoginPage assertion: this.userElm: $BUILT .user.loginDialog'

//loginPage.logout();   //=> TypeError: Object #<Object> has no method 'logout'
console.log(loginDialog.logout()); //=> 'logging out of Dialog. user was: $BUILT .user.loginDialog'

Answer 1

这是我为培训我的一些同事创建好的 Protractor 测试套件而设置的教程的链接。

一切都是实时的，您可以访问、探索等演示站点。

https://github.com/Droogans/ProtractorPageObjects

这将为您设置安装、大纲、组织技术等。

如果您有任何问题，请随时提出问题。